import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Welcome from '../components/Welcome.vue'
import Home from '../components/Home.vue'
import Users from '../components/user/Users.vue'


Vue.use(VueRouter)

const routes = [
  { path:'/' , redirect:'/login' },
  { path:'/login', component:Login },
  { path: '/home',
    component: Home ,
    redirect:'/welcome'  ,
    children:[
      {path:'/welcome',component:Welcome},
      {path:'/users',component:Users}
  ]
  },
 

]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

//挂载路由导航守卫
router.beforeEach((to,from,next)=>{
  //to 将要访问的路径
  //from 代表从哪个路径跳转而来
  //next是一个函数，表示放行
  //1.next()直接放行 2.next('/login')强制跳转
  if(to.path==='/login') return next()
  //获取token
  const tokenStr=window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})

export default router
